Species: albertensis LAMBE, 1913
Etymology: In reference to the province of Alberta in Canada.
= Monoclonius albertensis (LAMBE, 1913) LEAHY, 1987

Holotype: NMC 344

Locality: Dinosaur Provincial Park, about 1 1/2 miles southeast of Denhart Ferry, Dinosaur Provincial Park, Red Deer River, Alberta Province, Canada.

Horizon: Dinosaur Park Formation, upper Judith River Group.

Biostratigraphy:

Age: Judithian age, Middle Campanian Stage, middle Senonian subepoch, upper Gulf Epoch, Late Cretaceous.

Material: Skull and skeleton.
Note: A year later after the find of the skull, the skeleton was discovered.

Referred material:

SWEENEY & BOYDEN, 1993

Locality: Along the Milk River, just south of the 49th parallel, Montana.

Horizon: Judith River Formation.

Biostratigraphy:

Age: Judithian age, Middle Campanian Stage, middle Senonian subepoch, upper Gulf Epoch, Late Cretaceous.

Material:

Number: Not given: Right parietal, predentary, nose horn, left femur, left ilium, base of occipital, right humerus, a dorsal vertebra and 5 ribs.

 

TANKE PERS. COM.

Locality: Quarry 179, Dinosaur Provincial Park, Alberta Province, Canada.

Horizon: Dinosaur Park Formation, upper Judith River Group.

Biostratigraphy:

Age: Judithian age, Middle Campanian Stage, middle Senonian subepoch, upper Gulf Epoch, Late Cretaceous.

Material:

RTMP 86.126.1: Skull missing nasal horn of a juvenile.
Note: Was thought to be a Centrosaurus.

RYAN, EBERTH, BRINKMAN & RUSSELL, 1998

RTMP. 89.97-1, RTMP 89.36.20: Fragmentary skulls.

= Styracosaurus parksi BROWN & SCHLAIKJER, 1937
Etymology:

Holotype: AMNH 5372

Locality: Dinosaur Provincial Park, middle fork of Sand Creek on the right bank, approximately 250 feet above the Red Deer River, 12 miles below Steveville, Alberta Province, Canada.

Horizon: Dinosaur Park Formation, upper Judith River Group.

Biostratigraphy:

Age: Judithian age, Middle Campanian Stage, middle Senonian subepoch, upper Gulf Epoch, Late Cretaceous.

Material: Fragmentary skull, fragmentary dentary and a nearly complete skeleton.

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A Styracosaurus bone bed (Bonebed 42) has been found at Dinosaur Provincial Park, Alberta, Canada.
CURRIE & DODSON, 1984

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Species: ovatus GILMORE, 1930
Etymology:

Holotype: USNM 11869

Locality: T37N, R8W, Milk River, Blackfeet Indian Reservation, Glacier County, Montana.

Horizon: Two Medicine Formation.

Biostratigraphy:

Age: Judithian age, Campanian Stage, Senonian subepoch, Upper Gulf epoch, Late Cretaceous.

Material: Posterior portion of frill and numerous fragments.